Bài 2.Tính a) 8 dam + 5 dam = b) 720 m + 43 m = 57 hm – 28 hm = 403cm – 52 cm = 12 km x 4 = 27 mm :
Câu 2. Tính
a) 8 dam + 5 dam = b) 720 m + 43 m =
57 hm – 28 hm = 403cm – 52 cm =
12 km x 4 = 27 mm : 3 =
Giải:
a) 8 dam + 5 dam = 13 dam b) 720 m + 43 m = 763 m
57 hm – 28 hm = 29 hm 403cm – 52 cm = 351 cm
12 km x 4 = 48 km 27 mm : 3 = 9 mm